#include "editor_view.h"
#include <apps/global_preferences.h>
#include <poincare/integer.h>
#include <escher/app.h>
#include <poincare/preferences.h>

namespace Code {

/* EditorView */

EditorView::EditorView(Responder * parentResponder, App * pythonDelegate) :
  Responder(parentResponder),
  View(),
  m_textArea(parentResponder, pythonDelegate, GlobalPreferences::sharedGlobalPreferences()->font()),
  m_gutterView(GlobalPreferences::sharedGlobalPreferences()->font())
{
  m_textArea.setScrollViewDelegate(this);
}

void EditorView::resetSelection() {
  m_textArea.resetSelection();
}

void EditorView::scrollViewDidChangeOffset(ScrollViewDataSource * scrollViewDataSource) {
  m_gutterView.setOffset(scrollViewDataSource->offset().y());
}

View * EditorView::subviewAtIndex(int index) {
  if (index == 0) {
    return &m_textArea;
  }
  assert(index == 1);
  return &m_gutterView;
}

void EditorView::didBecomeFirstResponder() {
  Container::activeApp()->setFirstResponder(&m_textArea);
}

void EditorView::layoutSubviews(bool force) {
  m_gutterView.setOffset(0);
  KDCoordinate gutterWidth = m_gutterView.minimalSizeForOptimalDisplay().width();
  m_gutterView.setFrame(KDRect(0, 0, gutterWidth, bounds().height()), force);

  m_textArea.setFrame(KDRect(
        gutterWidth,
        0,
        bounds().width()-gutterWidth,
        bounds().height()),
      force);
}

/* EditorView::GutterView */

void EditorView::GutterView::drawRect(KDContext * ctx, KDRect rect) const {
  KDColor textColor = KDColor::RGB24(0x919EA4);
  KDColor backgroundColor = KDColor::RGB24(0xE4E6E7);

  ctx->fillRect(rect, backgroundColor);

  KDSize glyphSize = Poincare::Preferences::sharedPreferences()->KDPythonFont()->glyphSize();

  KDCoordinate firstLine = m_offset / glyphSize.height();
  KDCoordinate firstLinePixelOffset = m_offset - firstLine * glyphSize.height();

  char lineNumber[4];
  int numberOfLines = bounds().height() / glyphSize.height() + 1;
  for (int i=0; i<numberOfLines; i++) {
    Poincare::Integer line(i + firstLine + 1);
    line.serialize(lineNumber, 4);
    KDCoordinate leftPadding = (2 - strlen(lineNumber)) * glyphSize.width();
    ctx->drawString(
      lineNumber,
      KDPoint(k_margin + leftPadding, i*glyphSize.height() - firstLinePixelOffset),
      Poincare::Preferences::sharedPreferences()->KDPythonFont(),
      textColor,
      backgroundColor
    );
  }
}

void EditorView::GutterView::setOffset(KDCoordinate offset) {
  if (m_offset == offset) {
    return;
  }
  m_offset = offset;
  markRectAsDirty(bounds());
}


KDSize EditorView::GutterView::minimalSizeForOptimalDisplay() const {
  int numberOfChars = 2; // TODO: Could be computed
  return KDSize(2 * k_margin + numberOfChars * Poincare::Preferences::sharedPreferences()->KDPythonFont()->glyphSize().width(), 0);
}

}